[R-sig-Geo] Export raster from R to Arcgis

[Komine]

Dear,
My objective is to save a raster created with R and to open it with Arcgis
in maintaining spatial reference.
I used GPS points (XYZ, spatial reference: WGS 84, UTM) with which I created
a raster following this code:

> Image<-read.table("C:\\Users\\Documents\\data.txt",sep="",dec=",",header=TRUE) 
> library(raster)   
> testo<-rasterFromXYZ(Image) 
> map<-plot(testo)

Then, I save the output by clicking < File < save < and to choose format
(.tif).
However, When I open the output with Arcgis, it has not spatial reference. 
How to save the output into .tif in maintaining the spatial reference. 
Thank you in advance 
Komine 



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